物探与化探2025，Vol.49Issue(3)：614-619,6.DOI:10.11720/wtyht.2025.1173
音频大地电磁接地电阻校正技术研究
Exploring a correction technology for ground resistance in audio-frequency magnetotelluric measurements
摘要
Abstract
Ground resistance is a significant factor affecting the accuracy of audio-frequency magnetotelluric(AMT)measurements.Hence,reducing the interference from ground resistance is critical for enhancing the reliability and interpretation accuracy of AMT da-ta.By delving into the impacts of ground resistance on the measured electric field,apparent resistivity,and impedance phase,this study proposed a numerical correction method for reducing the impacts of ground resistance to a negligible level.As indicated by the theoretical calculation results,too high ground resistance can reduce the apparent resistivity in high-frequency bands to a quarter of the original value and shift the impedance phase by a maximum of 20°.The correction results of measured data demonstrate that the pro-posed method can enhance the accuracy of the AMT method in detecting shallow information by effectively reducing the interference from ground resistance.Therefore,this study holds critical significance for improving the application of the AMT method in engineering exploration.关键词
音频大地电磁法/接地电阻/视电阻率/阻抗相位/校正Key words
audio-frequency magnetotelluric(AMT)method/ground resistance/apparent resistivity/impedance phase/correction分类
天文与地球科学引用本文复制引用
李栋,张明财,吴远洋..音频大地电磁接地电阻校正技术研究[J].物探与化探,2025,49(3):614-619,6.基金项目
中国电建核心科技攻关项目(DJ-HXGG-2023-08) （DJ-HXGG-2023-08）
中国电建集团西北勘测设计研究院有限公司科技项目(XBY-DKY-2023-26) （XBY-DKY-2023-26）
